Kieu started collecting the bronze drums before 1975 when he was a doctor in south Vietnam's airborne division.

Kieu在1975年之前就开始收集铜鼓，当时他是越南南部空降师的一名医生。

Some of Vietnam's earliest written history was inscribed on the Dong Son, bronze drums, first made in Vietnam over 2000 years ago.

越南最早的一些文字记载的历史是两千年前镌刻在越南制造的铜鼓上的。